July 30 (Reuters) - Wall Street's main indexes opened

higher on Tuesday, as cautious investors awaited the day's Big

Tech earnings and labor numbers and hoped for clues on the

timing of interest-rate cuts in this week's U.S. policy

decision.

The Dow Jones Industrial Average rose 82.2 points, or

0.20%, at the open to 40,622.13. The S&P 500 rose 15.2

points, or 0.28%, at the open to 5,478.73​, while the Nasdaq

Composite rose 53.9 points, or 0.31%, to 17,424.1 at the

opening bell.